Find the angle between the line whose direction cosines are given by `l+m+n=0a n d2l^2+2m^2-n^2-0.`

Find the angle between the line whose direction cosines are given by l+m+n=0 a n d 2l^2+2m^2-n^2=0.

Find the angle between the line whose direction cosines are given by l+m+n=0 and 2l^(2)+2m^(2)-n^(2)-0

Find the angle between the line whose direction cosines are given by l+m+n=0a n dl^2+m^2-n^2=0.

Find the angle between the line whose direction cosines are given by l+m+n=0a n dl^2+m^2-n^2-0.

Find the angle between the lines whose direction cosines are given by : 2l-m+2n=0, mn+nl+lm=0 .

The angle between the lines whose direction cosines are given by 3l+4m+5n=0 , l^(2)+m^(2)-n^(2)=0 is

The angle between the lines whose direction cosines are given by l + m + n = 0 and l^2 = m^2 + n^2 is .....

Find the acute angle between the two straight lines whose direction cosines are given by l+m+n=0 and l^2+m^2-n^2=0